Re: [w3ctag/design-reviews] WebGPU and WGSL (#626)

I haven't had enough time to dive deep into the spec, but here are some questions after giving it a quick first-pass.

1. Lots of strings in the API is USVString - feels like DOMString would be more appropriate, is there something I'm missing?
2. Given the power of the API, would it make sense to consider gating this behind a permission? I believe the counter argument is - why should this be behind a permission when WebGL is not, and I think WebGL was an unfortunate choice given how it is being abused to fingerprint users.
3. Should the cache be origin-gated? If the compilation is incredibly fast this shouldn't be an issue, but with slow enough compilation times timing-based fingerprinting feels like it would be possible.
4. Is there a story for mitigating denial-of-service by exhausting VRAM? (Technically, I guess it won't be a denial of service, but more of a "new tabs paint crazy slow" from an end-user perspective.)

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